content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.operators;
  
  import java.util.Objects;
  import java.util.concurrent.atomic.AtomicReference;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
  
  /**
   * Makes sure an upstream error skips the flow created with a
   * transformer and then re-emitted when the inner flow terminates.
   * <p>
   * This operator is like an external delay-error behavior, allowing
   * an inner transformed flow to complete normally but still fail the
   * flow further down.
   * @param <T> the upstream value type
   * @param <R> the downstream value type
   * @since 0.19.1
   */
  final class ObservableErrorJump<T, R> extends Observable<R> implements ObservableTransformer<T, R> {
  
      final Observable<T> source;
  
      final ObservableTransformer<T, R> transformer;
  
      ObservableErrorJump(Observable<T> source, ObservableTransformer<T, R> transformer) {
          this.source = source;
          this.transformer = transformer;
      }
  
      @Override
      public ObservableSource<R> apply(Observable<T> upstream) {
          return new ObservableErrorJump<>(upstream, transformer);
      }
  
      @Override
      protected void subscribeActual(Observer<? super R> observer) {
  
          ErrorJumpFront<T, R> front = new ErrorJumpFront<>(source, observer);
  
          ObservableSource<R> downstream;
  
          try {
              downstream = Objects.requireNonNull(
                      transformer.apply(front),
                      "The transformer returned a null Publisher");
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              EmptyDisposable.error(ex, observer);
              return;
          }
  
          downstream.subscribe(front.end);
      }
  
      static final class ErrorJumpFront<T, R> extends Observable<T> implements Observer<T>, Disposable {
  
          final Observable<T> source;
  
          final AtomicReference<Observer<? super T>> middle;
  
          final EndSubscriber end;
  
          Disposable upstream;
  
          ErrorJumpFront(Observable<T> source, Observer<? super R> downstream) {
              this.source = source;
              this.middle = new AtomicReference<>();
              this.end = new EndSubscriber(downstream);
          }
  
          @Override
          protected void subscribeActual(Observer<? super T> observer) {
              if (middle.compareAndSet(null, observer)) {
                  source.subscribe(this);
              } else {
                  EmptyDisposable.error(new IllegalStateException("Only one Subscriber allowed"), observer);
              }
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              upstream = d;
              middle.get().onSubscribe(this);
          }
  
          @Override
          public void onNext(T t) {
              middle.get().onNext(t);
          }
  
          @Override
          public void onError(Throwable t) {
              end.set(t);
              middle.get().onComplete();
          }
  
          @Override
          public void onComplete() {
              middle.get().onComplete();
          }
  
          @Override
          public void dispose() {
              upstream.dispose();
          }
  
          @Override
          public boolean isDisposed() {
              return upstream.isDisposed();
          }
  
          final class EndSubscriber
          extends AtomicReference<Throwable>
          implements Observer<R>, Disposable {
  
              private static final long serialVersionUID = -5718512540714037078L;
  
              final Observer<? super R> downstream;
  
              Disposable upstream;
  
              EndSubscriber(Observer<? super R> downstream) {
                  this.downstream = downstream;
              }
  
              @Override
              public void onSubscribe(Disposable d) {
                  upstream = d;
                  downstream.onSubscribe(this);
              }
  
              @Override
              public void onNext(R t) {
                  downstream.onNext(t);
              }
  
              @Override
              public void onError(Throwable t) {
                  Throwable ex = get();
                  if (ex != null) {
                      t = new CompositeException(ex, t);
                  }
                  downstream.onError(t);
              }
  
              @Override
              public void onComplete() {
                  Throwable ex = get();
                  if (ex != null) {
                      downstream.onError(ex);
                  } else {
                      downstream.onComplete();
                  }
              }
  
              @Override
              public void dispose() {
                  upstream.dispose();
              }
  
              @Override
              public boolean isDisposed() {
                  return upstream.isDisposed();
              }
          }
      }
  }
  